20989115 has 16 divisors (see below), whose sum is σ = 29153280. Its totient is φ = 14208480.

The previous prime is 20989103. The next prime is 20989147. The reversal of 20989115 is 51198902.

It is not a de Polignac number, because 20989115 - 2¹⁸ = 20726971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1031 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (1822080).

Almost surely, 2^20989115 is an apocalyptic number.

20989115 is a deficient number, since it is larger than the sum of its proper divisors (8164165).

20989115 is an equidigital number, since it uses as much as digits as its factorization.

20989115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7682.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 20989115 is about 4581.3878901486. The cubic root of 20989115 is about 275.8447413209.

The spelling of 20989115 in words is "twenty million, nine hundred eighty-nine thousand, one hundred fifteen".